1. Data Analysis with Open Source Tools This learnt me how to analyze "small" datasets which have helped me incredibly in my career. Technology wise is very ou

1. Data Analysis with Open Source Tools This learnt me how to analyze "small" datasets which have helped me incredibly in my career. Technology wise is very out of date, but the concepts are still valid. I think it's hard to get more with less investmtent. Really underrated book. 2. Expert Oracle Database Architecture If you have to develop on Oracle (something I undestand it's not very popular in HN), you have to read it. It's a great book that delves into the why's and not only into the how's. 3. Software Estimation: Demystifying the Black Art. Only the "cone of uncertainty" concept would make it a must-read. It provided me a framework for doing estimations and at same time, to worry less about them. It has helped me to divert lots of uncomfortable conversations about "when" towards a much more productive "what-and-why-is-needed".